| ( | 7210911 1000 | − | x | ) | ÷ | x | = | 4 125 |
| 方程两边同时乘以: | x |
| ( | 7210911 1000 | − | x | ) | = | 4 125 | x |
7210911 1000 | − | x | = | 4 125 | x |
| - | x | − | 4 125 | x | = | - | 7210911 1000 |
| - | 129 125 | x | = | - | 7210911 1000 |
7210911 1000 | = | 129 125 | x |
129 125 | x | = | 7210911 1000 |
| x | = | 7210911 1000 | ÷ | 129 125 |
| = | 7210911 1000 | × | 125 129 |
| = | 2403637 8 | × | 1 43 |
| x | = | 2403637 344 |
| x | = | 6987.31686 |